Determine the concentrations of the stock solution and four dilutions. dilution #1 = 10.00 ml of stock diluted to 25.00 ml dilution #2 = 7.50 ml of stock diluted to 25.00 ml dilution #3 = 5.00 ml of stock diluted to 25.00 ml dilution #4 = 2.50 ml of stock diluted to 25.00 ml dilution #1 = 10.00 ml of stock diluted to 25.00 ml dilution #2 = 7.50 ml of stock diluted to 25.00 ml dilution #3 = 5.00 ml of stock diluted to 25.00 ml dilution #4 = 2.50 ml of stock diluted to 25.00 ml